EPJ Web Conf.
Volume 152, 2017Wide-Field Variability Surveys: A 21st Century Perspective – 22nd Los Alamos Stellar Pulsation – Conference Series Meeting
|Number of page(s)||5|
|Section||Past and current surveys: What we have learned, where we are standing|
|Published online||08 September 2017|
Spitzer observations of large amplitude variables in the LMC and IC 1613
1 South African Astronomical Observatory & Astronomy Department, University of Cape Town, South Africa
2 Division of Physics, Mathematics and Astronomy, CIT, Pasadena, CA 91125, USA
3 NASA Goddard Space Flight Center, MC 665, 8800 Greenbelt Road, Greenbelt, MD 20771, USA
4 Department of Astronomy, University of Maryland, College Park, MD 20742, USA
Published online: 8 September 2017
The 3.6 and 4.5 ìm characteristics of asymptotic giant branch variables in the LMC and IC 1613 are discussed. For C-rich Mira variables there is a very clear periodluminosity-colour relation, where the [3.6] . [4.5] colour is associated with the amount of circumstellar material and correlated with the pulsation amplitude. The [4.5] periodluminosity relation for dusty stars is approximately one mag brighter than for their naked counterparts with comparable periods.
© The Authors, published by EDP Sciences, 2017
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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